With reference to the deficiency of Vitamin A, consider the following statements: 1. It can cause night blindness. 2. It improves vision in dim light. 3. It can cause complete loss of vision. Which of the statements given above are correct?

The correct option is (c). Explanation Vitamin A (Retinol) is a fat-soluble micronutrient critical for maintaining healthy vision, particularly in low-light conditions. It is a component of rhodopsin, a protein in the retina that absorbs light. A deficiency in Vitamin A leads to a spectrum of ocular disorders collectively known as Xerophthalmia. Statement-wise Analysis: - Statement 1 is Correct: One of the earliest clinical signs of Vitamin A deficiency is Nyctalopia, commonly known as night blindness. This condition results from the inability of the retina to regenerate rhodopsin efficiently, making it difficult to see in dim light. - Statement 2 is Incorrect: The statement refers to the deficiency of Vitamin A. A deficiency impairs the eye's ability to adapt to darkness; it does not improve vision. While Vitamin A itself is necessary for vision in dim light, its lack leads to deterioration of this function. - Statement 3 is Correct: If left untreated, Vitamin A deficiency progresses to more severe stages, including xerosis (dryness of the conjunctiva and cornea) and Keratomalacia (softening and ulceration of the cornea). This can lead to corneal scarring and permanent, complete loss of vision. Key Takeaway: Vitamin A deficiency is a leading cause of preventable childhood blindness, progressing from night blindness to permanent corneal damage (Keratomalacia) if not addressed.

With reference to the deficiency of Vitamin A, con... - NCERT Class 6 Science MCQ

The correct option is (c).

Explanation

Vitamin A (Retinol) is a fat-soluble micronutrient critical for maintaining healthy vision, particularly in low-light conditions. It is a component of rhodopsin, a protein in the retina that absorbs light. A deficiency in Vitamin A leads to a spectrum of ocular disorders collectively known as Xerophthalmia.

Statement-wise Analysis:

Statement 1 is Correct: One of the earliest clinical signs of Vitamin A deficiency is Nyctalopia, commonly known as night blindness. This condition results from the inability of the retina to regenerate rhodopsin efficiently, making it difficult to see in dim light.
Statement 2 is Incorrect: The statement refers to the deficiency of Vitamin A. A deficiency impairs the eye's ability to adapt to darkness; it does not improve vision. While Vitamin A itself is necessary for vision in dim light, its lack leads to deterioration of this function.
Statement 3 is Correct: If left untreated, Vitamin A deficiency progresses to more severe stages, including xerosis (dryness of the conjunctiva and cornea) and Keratomalacia (softening and ulceration of the cornea). This can lead to corneal scarring and permanent, complete loss of vision.

Key Takeaway:
Vitamin A deficiency is a leading cause of preventable childhood blindness, progressing from night blindness to permanent corneal damage (Keratomalacia) if not addressed.

NCERT Class 6 Science — Chapter 2: Components of food

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